Wipro Chairman and a co-Chair of the World Economic Forum Azim Premji has said that the outlook for global economy has turned positive this year and the worst is over even though the road ahead is full of challenges.Premji said in his message to the global business and government leaders for the 40th WEF meeting at Davos that the last 12-18 months have been very difficult for the global economy.He said, the road to recovery, however, would vary in different economies. He said, while the mature economies are taking time, the emerging economies like India, Brazil and China have already started to show smart growth recovery.Premji is the sole Indian CEO who has been placed among top six global CEOs by the WEF, that has sought to influence policy-makers, businesses and civil society across the world for the past four decades.AIR correspondent reports that this year the theme is Rethink, Redesign, Rebuild. India is represented at the meeting by Surface Transport minister Kamal Nath, Commerce minister Anand Sharma, Planning Commission Deputy Chairman Montek Singh Alhuwalia, business tycoons inlcuding Reliance industries chief Mukesh Ambani, Wipro chief Azim Premji and Rahul Bajaj among others.